CRT monitors, while they've improved significantly the past few years, are real energy pigs. You can save quite a bit of energy by just shutting the things off when you're not going to be using them. I have my monitor set to go into power save mode if there's been no activity for 20 minutes. LCD monitors use considerably less energy, and might be a worthwhile investment.
And some general energy bill lowering tips... Get compact florescent lightbulbs. They generate about the same amount of light at about 1/3 the energy consumption of incandescent bulbs. A 100W equivalent florescent uses around 23W of energy. They cost a bit more at the store, but you'll easily make that up on energy savings over time. Not to mention florescent bulbs tend to last significantly longer. Most are estimated to have a lifespan of about 5 years, as opposed to a few hundred hours for incandescent. So it's just an added bonus that you won't have to buy as many bulbs or replace them nearly as often.
Also, a tip courtesy of Mythbusters... Even if you're going to come back to a room shortly, you save money by turning the lights off and back on again. The long tube florescent bulbs had the longest time period between how much energy it took to start it up, and how long it would have to run to use the same amount of energy... It came out to around 25 seconds. All other bulbs tested were either a fraction of a second, or one or two seconds. So even if you're only going to be gone for a minute, it's worth it to shut the lights off.
If you have a fireplace, make sure you have some way of closing it. Particularly if you live in an area that experiences winter. Fireplaces are very inefficient, so it might be a worthwhile investment to get some sort of decorative frame with a door for it, or one that has better insulation abilities.
Putting plastic over windows in the winter is a good cheap method of saving some money in the winter if it gets cold where you live.
Another good one is unplugging things that you don't really use often. Even when turned off, a lot of devices still draw power. TVs, radios, game consoles, that sort of thing. If you know anyone who's an electrician, you could try to get them to wire some of those outlets to a wall switch to make things easier.
Plenty of other ways to reduce your utility bills, but you can search for them on your own.